In case anyone rebooted (like me) and ended up with a message like:

"Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-
block(0,0)"

Just go to the grub menu, select Advanced Options > pick a previous
kernel and boot, once you get the terminal, type:

sudo dpkg --configure -a

Or: Advanced Options > pick a previous kernel (in recovery mode), get a
root terminal from the menu, run:

dpkg --configure -a

The upgrade process should continue. Once it's completed just reboot and
the system should be updated.

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https://bugs.launchpad.net/bugs/1968845

Title:
  Upgrade to 22.04 from 20.04 ends with dbus installation asking for a
  reboot

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